Ribbon cartridge for a thermal printer



FIG. 1 is a perspective view of a ribbon cartridge for a thermal printer;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The area within the center circles of the spools in FIG. 3 forms no part of the claimed design. 

The ornamental design for a ribbon cartridge for a thermal printer, as shown and described. 